Shandong Longertek Technology 

Shandong Longertek Technology Co., Ltd. is engaged in the complete lifecycle of air conditioning and control systems for rail transit vehicles across China, from initial research and development through manufacturing, sales, and ongoing maintenance. Beyond its core focus on railway systems, the company offers a broad portfolio of products. This includes climate control solutions for both track-based and new energy vehicles, sophisticated thermal management products, and air-energy heat pump drying machinery. Longertek also provides intelligent digital environmental control products, various types of new energy equipment, specialized temperature regulation units for professional data centers, and integrated industrial air conditioning systems. The company was founded in 2000 and operates from its headquarters in Jinan, People's Republic of China.